Malicious PDF — malware analysis report

Static analysis result for SHA-256 b74f8ef7b34fa220…

MALICIOUS

PDF

13.3 KB
MD5: efc67ed33aada19155d3b7a015da84f4 SHA-1: 679a18bbb8c22fd228579ddf8f06be33b15f697f SHA-256: b74f8ef7b34fa220922cf3c0cafaa1d393ec43efbc43b8ef8b9b8f243db2c619
66 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by a machine learning classifier as malicious. It contains an embedded file and an embedded script payload, indicating an attempt to deliver a secondary malicious component. The presence of XFA form elements and embedded URLs, though benign or unknown, are common in exploit documents. The embedded script, while partially obfuscated, appears to be JavaScript designed to execute the embedded file.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
35fd06502814873515ba452da72790115b248b94086497e23c5faadeb39f82ed		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xD5 12856 bytes

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